Epicepon indicum Nierstrasz & Brender
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publication ID |
https://doi.org/ 10.6620/ZS.2021.60-04 |
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persistent identifier |
https://treatment.plazi.org/id/03E987A8-FFA7-FF94-FCB9-4D14F17C5802 |
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treatment provided by |
Felipe |
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scientific name |
Epicepon indicum Nierstrasz & Brender |
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Epicepon indicum Nierstrasz & Brender View in CoL à Brandis, 1931 ( Fig. 2 View Fig )
Epicepon indicum Nierstrasz & Brender à Brandis, 1931: 189–191,
figs. 74–77; Dollfus et al. 1933: 76 [list].
Material examined: Female syntype (2.8 mm TL), parasitizing Tymolus sp. , Kei Islands, Indonesia, St. 56, 05°30'S, 132°51'E, 345 m, coll. T. Mortensen, Danish Expedition to the Kei Islands, 10 May 1922 (ZMUC CR-6788).
Redescription: Female ( Fig. 2A–H View Fig ) length 2.8 mm; maximum width (across pereomere 3) 1.3 mm; head length 0.5 mm; head width 0.7 mm; pleon length 1.2 mm. Body linear (no asymmetry); all segments of body distinct ( Fig. 2A View Fig ).
Head ovate, wider than long, frontal margin rounded medially. Frontal lamina relatively thin and extending beyond sides and frontal margin of head ( Fig. 2A View Fig ). Eyes lacking. Antennules and antennae with three and four articles each, respectively, distalmost article of antennule and two distalmost articles of antenna terminally setose ( Fig. 2B View Fig ). Barbula with one slender, distally rounded lateral projection on each side, middle region smooth with low lateral lobe ( Fig. 2E, G View Fig ). Maxilliped with prominent anterior segment, palp as low non-articulated projection with few distal setae, plectron triangular, short and broad ( Fig. 2G View Fig ).
Pereon broadest across pereomere 3. Irregularly shaped tergal projections prominent on pereomeres 1–5 on right side, 2–4 on left side, ovate dorsolateral bosses on pereomeres 1–5 on right side, 2–3 on left side, thin coxal plates on both sides of pereomeres 1–5 ( Fig. 2A View Fig ). No mid-dorsal projections on any pereomeres. Oostegites enclosing brood pouch, oostegite 1 ( Fig. 2F View Fig ) with ovate anterior article, longer than posterior article, internal ridge smooth, posterior article rounded on lateral margin, extending to triangular point posteriorly. Pereopods subequal in structure, first four shorter than others ( Fig. 2A View Fig ). All pereopods with short, blunt dactyli, cylindrical propodi, carpi and meri fused in posterior pereopods ( Fig. 2C, D View Fig ).
Pleon with six segments, first five pleomeres each bearing five pairs of biramous pleopods and longer uniramous lateral plates, all margins with slight undulation but not digitate, surfaces smooth ( Fig. 2A, H View Fig ). Short digitiform endopods of pleopods approximately half as long as slender, distally tapering exopods ( Fig. 2H View Fig ). Terminal pleomere ending in uniramous uropods, similar to but slightly longer than fifth pleopodal exopods, surfaces smooth, margins with slight undulation but not digitate ( Fig. 2A, H View Fig ).
Male ( Fig. 2I–J View Fig ) with all body regions and segments distinct.
Head broadly rounded distally, extending posteriorly to rounded point overlapping approximately 1/3 length of pereomere 1 ( Fig. 2I View Fig ). Small, ovate dark eyes near posterolateral margins of head. Antennules and antennae not visible beyond margins of head in dorsal view.
Pereomeres 2 – 4 subequal in width, other pereomeres only slightly narrower ( Fig. 2I View Fig ). All pereomeres tapered laterally, lacking mid-ventral tubercles. All pereopods subequal in structure and size ( Fig. 2J View Fig ).
Pleon with six pleomeres, rounded laterally, each slightly narrower than preceding one ( Fig. 2I View Fig ). Mid-ventral tubercles lacking, pleopods as ventrolateral swelling on pleomeres 1–5 ( Fig. 2J View Fig ). Pleomere 6 without uropods, posterolaterally extended into two slender rami, each as long as rest of pleotelson; minute anal cone present distomedially ( Fig. 2I View Fig ).
Range: Known only from the type locality, Kei Islands, Indonesia, 05°30'S, 132°51'E, 345 m depth.
Remarks: The male syntype was incompletely described and figured by Nierstrasz & Brender à Brandis (1931) but is no longer in the vial with the female syntype and the above redescription of the male is therefore incomplete. The female syntype superficially appears to be immature based on the linear shape of the body but the oostegites are well-developed. The specific identity of the host is unknown as it was not retained with the parasites and the branchial chamber from which the parasites were extracted is not clear as the female is nearly linear.
Epicepon belema n. sp. ( Figs. 3 View Fig , 4 View Fig ) urn:lsid:zoobank.org:act:975C18A3-DE0C-4892-AEF0-D47ACEE92297
Material examined: Female holotype (2.0 mm TL including uropods), male allotype (1.1 mm TL) parasitizing right branchial chamber of Tymolus hirtipes Tan & Huang, 2000 , north of Panan, Pott (Phwoc) Island, Belep Islands, New Caledonia, Sta. CP172, 19°01'1.2"S, 163°16'1.2"E, 275–330 m, coll. MUSORSTOM 4, 17 Sept 1985 (ZRC 2016.0424).
Description: Female ( Fig. 3 View Fig ) length 2.0 mm; maximum width (across pereomere 3) 1.4 mm; head length 0.4 mm; head width 0.7 mm; pleon length 0.7 mm. Body slightly dextral; all segments of body distinct ( Fig. 3A View Fig ).
Head oblong, wider than long, extending into rounded lateral projections, frontal margin entire medially. Frontal lamina thin and extending slightly beyond frontal margin of head ( Fig. 3A View Fig ). Small, irregular black eyes present mediolaterally ( Fig. 3A View Fig ). Antennules and antennae with two and three articles each, respectively, distalmost article of each terminally setose ( Fig. 3B View Fig ). Barbula with hook-shaped rounded lateral projection ( Fig. 3G View Fig ) and one rounded lobe, middle region smooth with low lateral lobe ( Fig. 3H View Fig ). Maxilliped with prominent anterior segment, palp as low non-articulated projection with few distal setae, plectron triangular, short and thin ( Fig. 3G View Fig ).
Pereon broadest across pereomere 3. Irregularly shaped tergal projections prominent on pereomeres 1–5 on right side and 2–4 on left side, kidney-shaped dorsolateral bosses on both sides of pereomeres 1–4, thin coxal plates on both sides of pereomeres 1–4 ( Fig. 3A View Fig ). No mid-dorsal projections on any pereomeres. Oostegites enclosing brood pouch; oostegite 1 ( Fig. 3E, F View Fig ) with ovate anterior article, subequal in length to posterior article, internal ridge smooth, posterior article rounded distally (smaller posterior lobe is curled and has slight damage in holotype). Pereopods subequal in structure and size ( Fig. 3A View Fig ). All pereopods with short, blunt dactyli, cylindrical propodi, carpi and meri distinct in all pereopods ( Fig. 3C, D View Fig ).
Pleon with six segments, first five pleomeres each bearing pair of biramous pleopods and longer uniramous lateral plates, all margins with slight undulation but not digitate, surfaces smooth ( Fig. 3A, I View Fig ). Stub-like endopods of pleopods no more than half length of short, distally rounded exopods ( Fig. 3I, J View Fig ); exopods less than ½ length of lateral plates ( Fig. 3I, J View Fig ). Terminal pleomere ending in large uniramous uropods, similar to but longer than fifth pleopodal exopods, surfaces smooth, margins with slight undulation but not digitate ( Fig. 3A, I View Fig ).
Male ( Fig. 4 View Fig ) length 1.1 mm; maximum width (across pereomeres 3 and 4) 0.32 mm; head length 0.2 mm; head width 0.25 mm. All body regions and segments distinct ( Fig. 4A View Fig ).
Head expanded distally, rounded posteriorly, distinctly separated from first pereomere ( Fig. 4A View Fig ). Large, irregular dark eyes near posterolateral margins of head. Antennules and antennae not visible beyond margins of head in dorsal view, of three articles each; both bearing setae on all articles ( Fig. 4C View Fig ).
Pereomeres 3 and 4 subequal in width, other pereomeres only slightly narrower except pereomere 7 which is much narrower ( Fig. 4A View Fig ). All pereomeres rounded laterally, lacking mid-ventral tubercles. First pereopod larger than second, both larger than other five ( Fig. 4B, C, D View Fig ); all carpi with setae on distoventral ventral surface. Dactyli of pereopods 1 and 2 elongate, reaching distal margins of carpi ( Fig. 4B, C View Fig ), dactyli of pereopods 3–7 short, inserted into cup-like indentations at distoventral margin of propodi ( Fig. 4B, D View Fig ).
Pleon with six pleomeres, rounded laterally, each slightly narrower than preceding one ( Fig. 4A, B View Fig ). Mid-ventral tubercles absent, distinct pleopods present laterally on pleomeres 1–5. Pleomere 6 without uropods, posterolaterally extended into two slender rami, each longer than rest of pleotelson, both tipped with short setae; anal cone present distomedially ( Fig. 4A, B View Fig ).
Range: Known only from the type locality, north of Panan, Pott (Phwoc) Island, Belep Islands, New Caledonia, 275– 330 m.
Remarks: The female of Epicepon belema n. sp. can be distinguished from those of the other two in the genus in having a total length less than 2 times the maximum width ( E. indicum with total length greater than 2 times the maximum width) and pleopodal endopods greater than 1/4 length of the exopods, exopods less than 1/2 length of lateral plates, and barbula without slender elongated lobes ( E. japonica with pleopodal endopods less than 1/4 length of the exopods, exopods greater than 1/2 length of lateral plates; barbula of E. indicum with one slender elongate lobe, barbula of E. japonica with two slender elongated lobes).
Etymology: The specific name “ belema ” is both the name inhabitants of the Belep islands call themselves as well as the adjective used for things related to the Belep Islands; the name is used here as a noun in apposition.
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.