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2003
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| author | Plisko, Jadwiga Danuta |
| author_facet | Plisko, Jadwiga Danuta |
| contents | <p><b>Microchaetus quaerus sp.n.</b></p><p>(Fig. 6)</p><p>Etymology: L <i>quaero</i> = seek to learn. Refers to the unusual conjunction of internal characters noted in this species.</p><p>Material examined: <b>KwaZulu­Natal</b>: Holotype NMSA /Olig.03659 Hluhluwe Game Reserve, Mbombe Forest (28º03'15"S: 32º03'12"E) at 484 m, forest valley, slightly damp sandy­clay next to water­seep, 30 September 2002, AJA, DG. Paratypes: NMSA / Olig.03664, 2 cl + 1 juv collected with holotype.</p><p>Description based on holotype and paratypes.</p><p>External characters:</p><p><i>General</i>: body cylindrical. <i>Colour</i>: holotype, clitellate and juvenile paratypes preserved in alcohol for only a few days do not reveal pigmentation; grey­pinkish dorsally and ventrally. <i>Dimensions</i>: holotype preserved, slightly contracted, 104 mm long, 6 mm wide at 10, 8 mm wide at tubercula pubertatis; clitellate paratype 94 mm long, 6 mm wide at 10, 7 mm at clitellum; juvenile paratype 42 mm long, 3 mm wide. <i>Segment number</i>: holotype 180, clitellate paratype 170. <i>Prostomium</i>: prolobous, small, retracted into buccal cavity. <i>Segmentation</i>: secondary annulation present on preclitellar segments; 1 and 2 short, simple, with clear intersegmental furrow 1/2, both with irregular longitudinal grooves; 3 simple; 4–5 with two ringlets similar in size and appearance; 6 with two ringlets, first longer than second; 7–8 subdivided incompletely, 9 only partly demarcated; 10 and following simple, postclitellarly randomly demarcated. <i>Setae</i>: minute; in front of clitellum <i>aa</i> <<i>bc</i>, <i>ab</i> = <i>cd</i>. <i>Nephridial pores</i>: not observed. <i>Female pores</i>: obvious, paired, in 14 above <i>b</i> setae. <i>Male pores</i>: externally not observed; possibly in intersegmental furrow 18/19, as indicated by vasa deferentia entering body wall in segment 18. <i>Spermathecal pores</i>: externally difficult to trace, observed only at one side of one paratype, in intersegmental furrow 8/9; ectal parts of spermathecae were observed during dissection in intersegmental furrows 8/9 and 9/10 respectively.</p><p>Clitellar region (Fig. 6): <i>Clitellum</i>: whitish­grey; elongated, clearly segmented; on 11–27, anterior and posterior borders are not clearly marked; anteriorly ventral borders extend to line of papillae located on <i>ab</i> setae; on 19–24 bordering tubercula pubertatis; thin clitellar tissues also cover ventral parts of clitellar segments. <i>Tubercula pubertatis</i>: on holotype and paratypes glandular, segmented, elongated strips, on 19–24; ventrally extending to <i>ab</i> setae. <i>Papillae</i>: prominent, glandular, encircling <i>ab</i> setae on 7–10 and 25–27; on 11–18 small globular blisters on <i>ab</i> setae.</p><p>Internal characters:</p><p><i>Septa</i>: 4/5 thin, 5/6–6/7 slightly thicker than anterior; 7/8 and 8/9 thin. <i>Gizzard</i>: cylindrical, large, muscular, in 7. <i>Calciferous glands</i>: in 10, large, with only slightly marked separation dorsally; ventral separation little wider, although not apparent. <i>Intestine</i>: commences in 13; 10 pairs of yellowish, prominent, twice­folded dorso­lateral intestinal folds in segments 23–32. <i>Typhlosole</i>: commences in 17 as thin, flat tube; enlarging backwards changes into large U­shaped. In paratype terminates in segment 75. <i>Dorsal blood vessel</i>: 4–8 double, separated; 9 double, close, cordiform. <i>Paired dorsoventral vessels</i>: 4–8 enlarged vessels; 9–11 much enlarged, moniliform. <i>Nephridia</i>: meganephridia; little coiled loops with extended, ribbon­like caeca. <i>Spermiductal funnels</i>: holandric arrangement; two pairs, free, in 10 and 11 respectively. <i>Vasa deferentia</i>: commencing on lateral sides of spermiductal funnels in 10 and 11 respectively, extend and run to segment 18; penetrations into body wall occur probably at intersegmental furrow 18/19, but it was not confirmed. <i>Seminal vesicles</i>: two pairs of large sacs commencing at septa 10/11 and 11/12 respectively. <i>Spermathecae</i>: small, elongated thecae in 8 and 9; 2–4 at each side, with ectal parts in intersegmental furrows 8/9 and 9/10 respectively. <i>Ovaries</i>: not observed. <i>Genital glands</i>: glandular tissues in 19–24 associated with tubercula pubertatis.</p><p>Biological notes: Hluhluwe Game Reserve, situated between altitudes of 80–540 m, has lower­lying valleys and high ridges. It comprises coastal scarp forest with various thickets of mixed scrub, woodland, grasses and riparian vegetation. The species was found in moist sandy­clay soil in a higher, forested part, near seeping water. Mature individuals together with juveniles collected at the beginning of spring suggest sexual activity during a relatively mild winter. Associated with <i>Proandricus beddardi</i>. Acanthodrilidae were found nearby.</p><p>Distribution: Known only from the type locality (Fig. 1).</p><p>Discussion: Distinctive in having spermiductal pores in intersegmental furrows 8/9 and 9/10. Spermiductal pores in intersegmental furrow 8/9 do not occur in any other known microchaetid species. In <i>Microchaetus</i> the most anterior position of spermathecal pores was observed in <i>namaensis</i> (known only from the Northern Cape) whose anterior pores are in 9/10 and the other two rows of pores occur in intersegmental furrows 10/11 and 11/12 respectively. In the holandric genera <i>Tritogenia</i> and <i>Michalakus</i> the most anterior position of spermathecal pores is in intersegmental furrows 10/11 and 11/12 (<i>Tritogenia shawi</i> and <i>T</i>. <i>soleata</i><i>)</i>, and in <i>Michalakus initus</i> in 10/11, 11/12, 12/13. In some proandric species of the <i>lesothoensis</i> species­group the utmost anterior spermathecal pores occur in 9/10, or between ringlets in segment 9 (<i>Proandricus amphius</i> sp. n. and <i>P</i>. <i>oresbiosus</i> sp. n.). <i>M. quaerus</i> differs from congeners in the shape and positions of clitellum, tubercula pubertatis, and thickness of preclitellar septa.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_7666921 |
| institution | Zenodo |
| language | |
| publishDate | 2003 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Microchaetus quaerus Plisko 2003, sp.n. Plisko, Jadwiga Danuta Biodiversity Taxonomy Animalia Annelida Clitellata Crassiclitellata Microchaetidae Microchaetus Microchaetus quaerus <p><b>Microchaetus quaerus sp.n.</b></p><p>(Fig. 6)</p><p>Etymology: L <i>quaero</i> = seek to learn. Refers to the unusual conjunction of internal characters noted in this species.</p><p>Material examined: <b>KwaZulu­Natal</b>: Holotype NMSA /Olig.03659 Hluhluwe Game Reserve, Mbombe Forest (28º03'15"S: 32º03'12"E) at 484 m, forest valley, slightly damp sandy­clay next to water­seep, 30 September 2002, AJA, DG. Paratypes: NMSA / Olig.03664, 2 cl + 1 juv collected with holotype.</p><p>Description based on holotype and paratypes.</p><p>External characters:</p><p><i>General</i>: body cylindrical. <i>Colour</i>: holotype, clitellate and juvenile paratypes preserved in alcohol for only a few days do not reveal pigmentation; grey­pinkish dorsally and ventrally. <i>Dimensions</i>: holotype preserved, slightly contracted, 104 mm long, 6 mm wide at 10, 8 mm wide at tubercula pubertatis; clitellate paratype 94 mm long, 6 mm wide at 10, 7 mm at clitellum; juvenile paratype 42 mm long, 3 mm wide. <i>Segment number</i>: holotype 180, clitellate paratype 170. <i>Prostomium</i>: prolobous, small, retracted into buccal cavity. <i>Segmentation</i>: secondary annulation present on preclitellar segments; 1 and 2 short, simple, with clear intersegmental furrow 1/2, both with irregular longitudinal grooves; 3 simple; 4–5 with two ringlets similar in size and appearance; 6 with two ringlets, first longer than second; 7–8 subdivided incompletely, 9 only partly demarcated; 10 and following simple, postclitellarly randomly demarcated. <i>Setae</i>: minute; in front of clitellum <i>aa</i> <<i>bc</i>, <i>ab</i> = <i>cd</i>. <i>Nephridial pores</i>: not observed. <i>Female pores</i>: obvious, paired, in 14 above <i>b</i> setae. <i>Male pores</i>: externally not observed; possibly in intersegmental furrow 18/19, as indicated by vasa deferentia entering body wall in segment 18. <i>Spermathecal pores</i>: externally difficult to trace, observed only at one side of one paratype, in intersegmental furrow 8/9; ectal parts of spermathecae were observed during dissection in intersegmental furrows 8/9 and 9/10 respectively.</p><p>Clitellar region (Fig. 6): <i>Clitellum</i>: whitish­grey; elongated, clearly segmented; on 11–27, anterior and posterior borders are not clearly marked; anteriorly ventral borders extend to line of papillae located on <i>ab</i> setae; on 19–24 bordering tubercula pubertatis; thin clitellar tissues also cover ventral parts of clitellar segments. <i>Tubercula pubertatis</i>: on holotype and paratypes glandular, segmented, elongated strips, on 19–24; ventrally extending to <i>ab</i> setae. <i>Papillae</i>: prominent, glandular, encircling <i>ab</i> setae on 7–10 and 25–27; on 11–18 small globular blisters on <i>ab</i> setae.</p><p>Internal characters:</p><p><i>Septa</i>: 4/5 thin, 5/6–6/7 slightly thicker than anterior; 7/8 and 8/9 thin. <i>Gizzard</i>: cylindrical, large, muscular, in 7. <i>Calciferous glands</i>: in 10, large, with only slightly marked separation dorsally; ventral separation little wider, although not apparent. <i>Intestine</i>: commences in 13; 10 pairs of yellowish, prominent, twice­folded dorso­lateral intestinal folds in segments 23–32. <i>Typhlosole</i>: commences in 17 as thin, flat tube; enlarging backwards changes into large U­shaped. In paratype terminates in segment 75. <i>Dorsal blood vessel</i>: 4–8 double, separated; 9 double, close, cordiform. <i>Paired dorsoventral vessels</i>: 4–8 enlarged vessels; 9–11 much enlarged, moniliform. <i>Nephridia</i>: meganephridia; little coiled loops with extended, ribbon­like caeca. <i>Spermiductal funnels</i>: holandric arrangement; two pairs, free, in 10 and 11 respectively. <i>Vasa deferentia</i>: commencing on lateral sides of spermiductal funnels in 10 and 11 respectively, extend and run to segment 18; penetrations into body wall occur probably at intersegmental furrow 18/19, but it was not confirmed. <i>Seminal vesicles</i>: two pairs of large sacs commencing at septa 10/11 and 11/12 respectively. <i>Spermathecae</i>: small, elongated thecae in 8 and 9; 2–4 at each side, with ectal parts in intersegmental furrows 8/9 and 9/10 respectively. <i>Ovaries</i>: not observed. <i>Genital glands</i>: glandular tissues in 19–24 associated with tubercula pubertatis.</p><p>Biological notes: Hluhluwe Game Reserve, situated between altitudes of 80–540 m, has lower­lying valleys and high ridges. It comprises coastal scarp forest with various thickets of mixed scrub, woodland, grasses and riparian vegetation. The species was found in moist sandy­clay soil in a higher, forested part, near seeping water. Mature individuals together with juveniles collected at the beginning of spring suggest sexual activity during a relatively mild winter. Associated with <i>Proandricus beddardi</i>. Acanthodrilidae were found nearby.</p><p>Distribution: Known only from the type locality (Fig. 1).</p><p>Discussion: Distinctive in having spermiductal pores in intersegmental furrows 8/9 and 9/10. Spermiductal pores in intersegmental furrow 8/9 do not occur in any other known microchaetid species. In <i>Microchaetus</i> the most anterior position of spermathecal pores was observed in <i>namaensis</i> (known only from the Northern Cape) whose anterior pores are in 9/10 and the other two rows of pores occur in intersegmental furrows 10/11 and 11/12 respectively. In the holandric genera <i>Tritogenia</i> and <i>Michalakus</i> the most anterior position of spermathecal pores is in intersegmental furrows 10/11 and 11/12 (<i>Tritogenia shawi</i> and <i>T</i>. <i>soleata</i><i>)</i>, and in <i>Michalakus initus</i> in 10/11, 11/12, 12/13. In some proandric species of the <i>lesothoensis</i> species­group the utmost anterior spermathecal pores occur in 9/10, or between ringlets in segment 9 (<i>Proandricus amphius</i> sp. n. and <i>P</i>. <i>oresbiosus</i> sp. n.). <i>M. quaerus</i> differs from congeners in the shape and positions of clitellum, tubercula pubertatis, and thickness of preclitellar septa.</p> |
| title | Microchaetus quaerus Plisko 2003, sp.n. |
| topic | Biodiversity Taxonomy Animalia Annelida Clitellata Crassiclitellata Microchaetidae Microchaetus Microchaetus quaerus |
| url | https://doi.org/10.5281/zenodo.7666921 |