Lepusigobius Suzuki, Li & Chen, 2025, gen. nov.
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| author | Suzuki, Toshiyuki Li, Hsien-En Chen, I-Shiung |
| author_facet | Suzuki, Toshiyuki Li, Hsien-En Chen, I-Shiung |
| contents | <p><b><i>Lepusigobius</i> gen. nov.</b></p><p>New Japanese name: Asagiri-haze zoku</p><p><b>Type species</b> <i>Gobiosoma pallida</i> Herre, 1934</p><p><b>Diagnosis</b></p><p><i>Lepusigobius</i> <b>gen. nov.</b> can be distinguished from other gobiid genera by the following unique combination of characters: trunk moderately elongated; upper lip deeply clefted medially; anterior nostril openings tubular, without fleshy flaps; body totally scaleless; pelvic fins fused, forming an elongated cup, connecting frenum completely developed with scalloped posterior margin, median connecting membrane well-developed; cephalic sensory organs in reduced pattern (Fig. 1); sensory canal system reduced, anterior oculoscapular canal incomplete, interorbital pore λ singular, pore ω behind eye and terminal pore ρ absent, posterior oculoscapular canal and preopercle canal pores absent; sensory neuromast papillae patterns reduced, in transverse type pattern; a series of short papillae rows (rows <i>1–6</i>) radiating from orbit, rows <i>2–4</i> and <i>6</i> comprised by single papillae, row 5 interrupted (divided into <i>5s</i> and <i>5i</i>); row <i>b</i> interrupted, not reaching vertical point of posterior margin of orbit anteriorly; row <i>d</i> short, not reaching upper lip anteriorly and does not reach beyond preopercle posteriorly; rows <i>e</i> and <i>i</i> interrupted; row <i>ot</i> interrupted, upper tip not reaching the horizontal point of lower margin of orbit. Dorsal pterygiophore formula 3-12210; vertebrae 10 (precaudal)+16 (caudal)=26 (Fig. 2).</p><p><b>Etymology</b></p><p>The new generic name <i>Lepusigobius</i> is derived from <i>Lepus</i> (Leporidae rodent, commonly known as hares or wild rabbits) and <i>Gobius</i> (a gobiid genus), in reference to the distinct clefted upper lip of its species, the gender is masculine.</p><p><b>Comparisons</b></p><p><i>Lepusigobius</i> <b>gen. nov.</b> is readily assignable to the subfamily Gobiinae (<i>sensu</i> Pezold 1993) by having singular interorbital pore λ, anterior oculoscapular canals fused at the interorbital region and vertebral count 10+16=26, and its unique dorsal pterygiophore formula (3-12210) (Birdsong <i>et al.</i> 1988; Pezold 1993). Although <i>Lepusigobius</i> resembles the New World genus <i>Gobiosoma</i> Girard, 1858 in the complete absence of scales and general external morphology, it differs in having six (<i>vs.</i> seven) first dorsal fin spines, 10+16=26 (<i>vs.</i> 11+16=27) vertebrae, and in lacking posterior oculoscapular and preopercular canals (<i>vs.</i> present).</p><p><i>Lepusigobius</i> was previously confused with <i>Schismatogobius</i> de Beaufort, 1912 and <i>Cryptocentroides</i> Popta, 1922 (see species remarks for <i>Lepusigobius pallidus</i>). The total lack of any scales can be observed in both <i>Lepusigobius</i> and <i>Schismatogobius</i>, however the former can be distinguished from the latter by having singular pore λ (<i>vs.</i> pore λ absent) and higher counts of D2 (11 <i>–</i> 12 <i>vs.</i> 9) and anal fin rays (12 <i>vs.</i> 9). <i>Lepusigobius</i> shares little homology with <i>Cryptocentroides</i> except the two genera both has restricted gill opening.</p><p>The clefted upper lip of <i>Lepusigobius</i> is unique among all Indo-Pacific gobiine genera (Figs. 3–4). Its reduced, transversely arranged cephalic sensory papillae pattern resembles that of <i>Stonogobiops</i> Polunin & Lubbock, 1977. Both genera lack posterior oculoscapular canals, but <i>Lepusigobius</i> differs in having paired sets of two papillae in neuromast row <i>f</i> (<i>vs.</i> paired rows of several papillae) and a completely naked body (<i>vs.</i> covered with cycloid scales).</p><p><i>Lepusigobius</i> also shares with the western Pacific genus <i>Parkraemeria</i> Whitley, 1951 the presence of connection membrane between the dorsal fins and a reduced neuromast system, yet they differ markedly in detail. In <i>Lepusigobius</i>, the dorsal connection is basal, and evident only in males, whereas in <i>Parkraemeria</i> it is extensive, the second dorsal spine is absent, and the fins are confluent. Their neuromast patterns also differ, being transverse in <i>Lepusigobius</i> and longitudinal in <i>Parkraemeria</i>.</p><p>The slightly elongate body and relatively large eyes of <i>Lepusigobius</i> resemble those of several Indo-Pacific goby genera, including <i>Amblyeleotris</i> Bleeker, 1874, <i>Vanderhorstia</i> Smith, 1949, <i>Tomiyamichthys</i> Smith, 1956, <i>Flabelligobius</i> Smith, 1956, and <i>Ctenogobiops</i> Smith, 1959, and only <i>Amblyeleotris</i> shares a transverse neuromast pattern with <i>Lepusigobius</i>, but the two genera differ in several features: posterior oculoscapular and preopercular canals absent (<i>vs.</i> well developed); neuromast row f composed of paired sets of two papillae (<i>vs.</i> paired single papillae); gill opening extending from the upper pectoral-fin base to the vertical of row <i>os</i> (<i>vs.</i> to pore α); body completely naked (<i>vs.</i> covered with ctenoid and cycloid scales); dorsal fins basally connected (<i>vs.</i> well separated); and pelvic fins with complete frenum and median connecting membrane (<i>vs.</i> frenum absent, membrane present only basally). Comparative data were solely based upon the type species of each species; the data source and other details were summarized in Tables 2–3.</p><p>Smith (1955) ever described a new gobiid genus and species <i>Croilia mossambica</i> with an also slender body profile and highly connected dorsal fins. The species was found in estuarine areas and was only recorded from South Africa (Smith 1955; Smith 1959; Hoese 1986; Larson 2022). Based solely on its original description, <i>Lepusigobius</i> is similar to <i>Croilia</i> in general appearance but different from the latter in having a minute gill opening (<i>vs.</i> rather wide gill-opening, extending anteriorly to about the vertical of preopecle) and connections in dorsal fins (low connection between dorsal fins <i>vs.</i> both dorsal fins highly connected) although no any type information of head lateral-line system for <i>Croilia</i> has ever been reported.</p><p><b>Included species</b></p><p><i>Lepusigobius</i> comprises a single species, <i>L. pallida</i>. The species is re-described below.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_19198024 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Lepusigobius Suzuki, Li & Chen, 2025, gen. nov. Suzuki, Toshiyuki Li, Hsien-En Chen, I-Shiung Biodiversity Taxonomy Animalia Chordata Perciformes Gobiidae Lepusigobius <p><b><i>Lepusigobius</i> gen. nov.</b></p><p>New Japanese name: Asagiri-haze zoku</p><p><b>Type species</b> <i>Gobiosoma pallida</i> Herre, 1934</p><p><b>Diagnosis</b></p><p><i>Lepusigobius</i> <b>gen. nov.</b> can be distinguished from other gobiid genera by the following unique combination of characters: trunk moderately elongated; upper lip deeply clefted medially; anterior nostril openings tubular, without fleshy flaps; body totally scaleless; pelvic fins fused, forming an elongated cup, connecting frenum completely developed with scalloped posterior margin, median connecting membrane well-developed; cephalic sensory organs in reduced pattern (Fig. 1); sensory canal system reduced, anterior oculoscapular canal incomplete, interorbital pore λ singular, pore ω behind eye and terminal pore ρ absent, posterior oculoscapular canal and preopercle canal pores absent; sensory neuromast papillae patterns reduced, in transverse type pattern; a series of short papillae rows (rows <i>1–6</i>) radiating from orbit, rows <i>2–4</i> and <i>6</i> comprised by single papillae, row 5 interrupted (divided into <i>5s</i> and <i>5i</i>); row <i>b</i> interrupted, not reaching vertical point of posterior margin of orbit anteriorly; row <i>d</i> short, not reaching upper lip anteriorly and does not reach beyond preopercle posteriorly; rows <i>e</i> and <i>i</i> interrupted; row <i>ot</i> interrupted, upper tip not reaching the horizontal point of lower margin of orbit. Dorsal pterygiophore formula 3-12210; vertebrae 10 (precaudal)+16 (caudal)=26 (Fig. 2).</p><p><b>Etymology</b></p><p>The new generic name <i>Lepusigobius</i> is derived from <i>Lepus</i> (Leporidae rodent, commonly known as hares or wild rabbits) and <i>Gobius</i> (a gobiid genus), in reference to the distinct clefted upper lip of its species, the gender is masculine.</p><p><b>Comparisons</b></p><p><i>Lepusigobius</i> <b>gen. nov.</b> is readily assignable to the subfamily Gobiinae (<i>sensu</i> Pezold 1993) by having singular interorbital pore λ, anterior oculoscapular canals fused at the interorbital region and vertebral count 10+16=26, and its unique dorsal pterygiophore formula (3-12210) (Birdsong <i>et al.</i> 1988; Pezold 1993). Although <i>Lepusigobius</i> resembles the New World genus <i>Gobiosoma</i> Girard, 1858 in the complete absence of scales and general external morphology, it differs in having six (<i>vs.</i> seven) first dorsal fin spines, 10+16=26 (<i>vs.</i> 11+16=27) vertebrae, and in lacking posterior oculoscapular and preopercular canals (<i>vs.</i> present).</p><p><i>Lepusigobius</i> was previously confused with <i>Schismatogobius</i> de Beaufort, 1912 and <i>Cryptocentroides</i> Popta, 1922 (see species remarks for <i>Lepusigobius pallidus</i>). The total lack of any scales can be observed in both <i>Lepusigobius</i> and <i>Schismatogobius</i>, however the former can be distinguished from the latter by having singular pore λ (<i>vs.</i> pore λ absent) and higher counts of D2 (11 <i>–</i> 12 <i>vs.</i> 9) and anal fin rays (12 <i>vs.</i> 9). <i>Lepusigobius</i> shares little homology with <i>Cryptocentroides</i> except the two genera both has restricted gill opening.</p><p>The clefted upper lip of <i>Lepusigobius</i> is unique among all Indo-Pacific gobiine genera (Figs. 3–4). Its reduced, transversely arranged cephalic sensory papillae pattern resembles that of <i>Stonogobiops</i> Polunin & Lubbock, 1977. Both genera lack posterior oculoscapular canals, but <i>Lepusigobius</i> differs in having paired sets of two papillae in neuromast row <i>f</i> (<i>vs.</i> paired rows of several papillae) and a completely naked body (<i>vs.</i> covered with cycloid scales).</p><p><i>Lepusigobius</i> also shares with the western Pacific genus <i>Parkraemeria</i> Whitley, 1951 the presence of connection membrane between the dorsal fins and a reduced neuromast system, yet they differ markedly in detail. In <i>Lepusigobius</i>, the dorsal connection is basal, and evident only in males, whereas in <i>Parkraemeria</i> it is extensive, the second dorsal spine is absent, and the fins are confluent. Their neuromast patterns also differ, being transverse in <i>Lepusigobius</i> and longitudinal in <i>Parkraemeria</i>.</p><p>The slightly elongate body and relatively large eyes of <i>Lepusigobius</i> resemble those of several Indo-Pacific goby genera, including <i>Amblyeleotris</i> Bleeker, 1874, <i>Vanderhorstia</i> Smith, 1949, <i>Tomiyamichthys</i> Smith, 1956, <i>Flabelligobius</i> Smith, 1956, and <i>Ctenogobiops</i> Smith, 1959, and only <i>Amblyeleotris</i> shares a transverse neuromast pattern with <i>Lepusigobius</i>, but the two genera differ in several features: posterior oculoscapular and preopercular canals absent (<i>vs.</i> well developed); neuromast row f composed of paired sets of two papillae (<i>vs.</i> paired single papillae); gill opening extending from the upper pectoral-fin base to the vertical of row <i>os</i> (<i>vs.</i> to pore α); body completely naked (<i>vs.</i> covered with ctenoid and cycloid scales); dorsal fins basally connected (<i>vs.</i> well separated); and pelvic fins with complete frenum and median connecting membrane (<i>vs.</i> frenum absent, membrane present only basally). Comparative data were solely based upon the type species of each species; the data source and other details were summarized in Tables 2–3.</p><p>Smith (1955) ever described a new gobiid genus and species <i>Croilia mossambica</i> with an also slender body profile and highly connected dorsal fins. The species was found in estuarine areas and was only recorded from South Africa (Smith 1955; Smith 1959; Hoese 1986; Larson 2022). Based solely on its original description, <i>Lepusigobius</i> is similar to <i>Croilia</i> in general appearance but different from the latter in having a minute gill opening (<i>vs.</i> rather wide gill-opening, extending anteriorly to about the vertical of preopecle) and connections in dorsal fins (low connection between dorsal fins <i>vs.</i> both dorsal fins highly connected) although no any type information of head lateral-line system for <i>Croilia</i> has ever been reported.</p><p><b>Included species</b></p><p><i>Lepusigobius</i> comprises a single species, <i>L. pallida</i>. The species is re-described below.</p> |
| title | Lepusigobius Suzuki, Li & Chen, 2025, gen. nov. |
| topic | Biodiversity Taxonomy Animalia Chordata Perciformes Gobiidae Lepusigobius |
| url | https://doi.org/10.5281/zenodo.19198024 |