Dipolydora contoyensis, Vı & Delgado-Blas, 2008
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publication ID |
https://doi.org/ 10.1080/00222930701831240 |
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persistent identifier |
https://treatment.plazi.org/id/03E87546-256E-FF9F-B2D4-FBE3FD0FFEBC |
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treatment provided by |
Carolina |
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scientific name |
Dipolydora contoyensis |
| status |
sp. nov. |
Dipolydora contoyensis View in CoL sp. nov.
( Figure 3 View Figure 3 )
Type material
Caribbean Sea: Contoy Island , Quintana Roo (21 ° 299N, 86 ° 489W), 28 February 2001, LH01-540, holotype ( LACM-AHF POLY 2192 ); LH01-630, one paratype (ECOSUR-0083) , six paratypes ( LACM-AHF POLY 2193 ) .
Description
Holotype
Complete specimen with 46 segments, 4.3 mm long, 0.3 mm wide at chaetiger 7. Prostomium bifid, with two rounded lobes. Caruncle extending posteriorly to chaetiger 4. Eyes and occipital antenna absent ( Figure 3A View Figure 3 ). Palps extending posteriorly to chaetiger 12. In alcohol body pale yellow; body and palp pigmentation absent.
Chaetiger 1 with well-developed postchaetal lamellae and capillaries in both rami ( Figure 3A View Figure 3 ). Winged capillary notochaetae of chaetigers 2–4, 6, and subsequent segments arranged in two rows; anterior row with chaetae short, thick ( Figure 3B View Figure 3 ), posterior row longer than anterior row; notopodial capillaries of posterior segments long, thin; posterior spines absent. Unilimbate capillary neurochaetae of chaetigers 2–4, 6 arranged similarly to notochaetae of same segments. Bidentate hooded hooks from chaetiger 7, up to five per fascicle, accompanied by one to two capillaries at segment 8; hooks without constriction on shaft, with narrow angle between main fang and secondary tooth and wide angle between main fang and shaft ( Figure 3C View Figure 3 ).
Chaetiger 5 greatly modified, larger than adjacent segments; lacking postchaetal lamellae, with three dorsal superior geniculate capillaries without sheath, and with four posteroventral fascicles of unilimbate capillaries. Row of five major spines alternating with pennoned companion chaetae ( Figure 3D View Figure 3 ). Major spines with two large accessory teeth on concave and convex sides ( Figure 3D View Figure 3 ).
Six pairs of branchiae on chaetigers 11–16, small at first, increasing in size and meeting at dorsal midline by about chaetiger 12. All branchiae basally free of notopodial lamellae.
Gizzard-like structure in intestinal tract absent.
Pygidium small, glandular, cuff-shaped with dorsal notch ( Figure 3E View Figure 3 ).
Variability
Paratypes 2.8–4.0 mm long, 0.3–0.4 mm wide, for 39–43 segments. All paratypes unpigmented, with bifid prostomium and caruncle extending to chaetiger 4; all specimens lacking eyes and occipital antenna, with branchiae on chaetigers 11–16. Hooded hooks from chaetiger 7, up to four hooks per fascicle, accompanied by one capillary. Chaetiger 5 with five to seven major spines with two lateral teeth, up to nine pennoned companion chaetae; four to five neurochaetae and three to four notochaetae present. One paratype with eggs in chaetigers 6–28. Pygidium small, glandular, cuff-shaped with dorsal notch.
Remarks
Dipolydora contoyensis sp. nov. belongs to the Dipolydora giardi group; which includes six species known to burrow into calcareous substrata ( Blake 1996). The morphology of two of these species, D. giardi and D. trilobata , was reviewed by Radashevsky and Petersen (2005). The new species resembles D. giardi ( Mesnil, 1896) and D. trilobata ( Radashevsky, 1993) in that they also have a bifid prostomium, eyes and occipital antennae are absent, major spines of segment 5 with accessories structures. Dipolydora contoyensis differs from D. giardi and D. trilobata in having a caruncle extending to chaetiger 4 instead of 3, having major spines with two large accessory teeth on both sides, instead of a large accessory tooth or flange and a smaller accessory spur, by lacking lobes on pygidium instead of having them. Dipolydora contoyensis also differs from D. giardi in that branchiae begin on chaetiger 11 instead of 9–10, and from D. trilobata in that branchiae begin on chaetiger 11 instead of 7–10, with bidentate hooded hooks in posterior chaetigers instead of unidentate hooks.
Ecology
Dipolydora contoyensis is found in burrows within rock fragments.
Etymology
The species name refers to Contoy Island, located off northern Quintana Roo, Mexico.
Distribution
Caribbean Sea: Contoy Island , Quintana Roo .
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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