Mothocya andoni, Wal & Smit & Bruce & Olaosebikan & Hadfield, 2021
|
publication ID |
https://doi.org/ 10.1016/j.ijppaw.2021.03.001 |
|
persistent identifier |
https://treatment.plazi.org/id/3C5E87C4-E27F-FFD1-FFF4-FF2DF2E5C58C |
|
treatment provided by |
Felipe |
|
scientific name |
Mothocya andoni |
| status |
|
3.1. Mothocya andoni View in CoL n. sp
Figs. 1–6. View Fig View Fig View Fig View Fig View Fig View Fig
3.1.1. Material examined
Holotype. Female (ovigerous, 15.0 mm total length, 8.0 mm width), from Andoni Creek , Niger Delta (4 ◦ 29 ′ 35.2 ′′ N 7 ◦ 20 ′ 09.0 ′′ E), Nigeria, August 2015, from the African moony, Monodactylus sebae (Cuvier, 1829) , coll: B Olaosebikan ( SAMC-A 092737).
Paratypes. Female (non-ovigerous, dissected, 18.0 mm total length, 9.0 mm width), same data as holotype. Three males (12.0 mm total length, 5.0 mm width, dissected; 7.0 mm total length, 4.0 mm width; 12.0 mm total length, 5.0 mm width), same data as holotype (SAMC- A092738) .
ZooBank registration: The Life Science Identifier ( LSID) of the article is urn:lsid:zoobank.org:pub:38FB6597-830B-45AA-A8BF-A692B39F765C . The LSID for the new name Mothocya andoni n. sp. is urn:lsid:zoobank.org:act:0E9734EF-E7AC-40B9-BA46-BD2686884CF5 .
3.1.2. Description ovigerous ♀ (holotype)
Fig. 1 View Fig
Body ovoid, slightly twisted to the right, 1.9 times as long as greatest width; dorsal surfaces smooth, polished in appearance, widest at pereonite 4, most narrow at pereonite 1. Cephalon trapezoid shaped, 0.8 times longer than wide, visible in dorsal view, with subtruncate rostrum;
3
frontal margin slightly ventrally folded. Eyes irregular in outline; one eye 0.2 times width of cephalon, 0.4 times length of cephalon. Pereonite 1 smooth, anterior border anteriorly expanded with connective tissue, anterolateral angles broadly rounded, extending to posterior margin of eyes. Pereon lateral margins mostly ovate posteriorly; posterior margins smooth and straight, pereonite 7 deeply recessed medially. Pereonites 1–4 increasing in length and width; 5–7 decreasing in length and width; 4–7 becoming progressively narrower, 2–3 subequal. Coxae 1–5 not extending past pereonite posterior margin; 6–7 extending slightly past pereonite posterior margin.
Pleon 0.2 times as long as total body length, pleonite 1 slightly visible in dorsal view; pleonites posterior margin smooth and curved, mostly concave. Pleonite 2 laterally entirely overlapped by pereonite 7. Pleonites 3–5 (most convex side) and 4–5 (less convex side) with free lateral margins. Pleonite 5 widest, posterior margin straight. Pleotelson broadly rounded, 0.6 times as long as anterior width, lateral margins convex.
Antennula consists of 6 articles; peduncle articles 1 and 2 distinct and articulated; article 2 0.6 times as long as article 1; article 3 1.4 times as long as wide, 0.2 times as long as combined lengths of articles 1 and 2; flagellum with 4 articles, extending to posterior margin of eye, without setae. Antenna consists of seven articles; peduncle article 3 1.1 times as long as article 2; article 4 1.6 times as long as wide, 1.1 times as long as article 3; article 5 1.6 times as long as wide, 1.1 times as long as article 4; flagellum with 5 articles, terminating without setae. Mandible present, ending in an acute incisor; mandible palp article 2–3 without setae. Maxillula lateral lobe with 4 terminal robust setae, mesial lobe with 4
4
large recurved robust setae. Maxilla with 2 distinct lobes, 2.7 times longer than wide; medial lobe with 2 robust setae; lateral lobe with 2 robust setae. Maxilliped consists of 3 articles, article 3 with 4 recurved robust setae.
Pereopod 1 basis 1.9 times as long as greatest width; ischium 0.6 times as long as basis; carpus with rounded proximal margin; propodus 1.4 times as long as wide; dactylus slender, 1.8 times as long as propodus, 3.9 times as long as basal width. Pereopod 7 basis 3.8 times as long as greatest width; ischium 0.7 times as long as basis, with slight bulbous protrusion; merus 0.7 times as long as wide, 0.3 times as long as ischium; carpus 0.9 times as long as wide, 0.5 times as long as ischium; propodus twice as long as wide, as long as ischium; dactylus slender, as long as propodus, 3.3 times as long as basal width.
Uropod peduncle 0.5 times longer than rami, lateral margin without setae; rami extending to the posterior end, or slightly beyond pleotelson posterior margin (shorter on the left side due to twisting), marginal setae absent. Uropod endopod narrowly rounded, 4 times as long as greatest width, lateral margin straight, mesial margin weakly convex, without setae. Uropod exopod extending beyond end of endopod, 4.8 times as long as greatest width, 1.6 times as long as endopod; lateral margin weakly convex, mesial margin straight, without setae.
3.1.3. Description non-ovigerous ♀ (paratype)
Non-described structures, same as ovigerous female.
Body ovoid, slightly twisted to the left, twice as long as greatest
5
width, widest at pereonite 3. Cephalon 0.5 times longer than wide. Frontal margin thickened, ventrally folded.
Pereonite 1 extend to anterior margin of eyes. Pereonites 1–3 increasing in length and width; 4–7 decreasing in length and width. Pleopod 1 exopod 1.1 times as long as wide, lateral margin strongly convex, distally broadly rounded, mesial margin strongly convex. Pleopod 1 endopod 1.6 times as long as wide, lateral margin straight, distally broadly rounded, mesial margin slightly convex, peduncle 2.7 times as wide as long. Pleopods 1–5 proximomedial lobes increasing in size, with proximomedial lobes. Pleopods 2–5 similar to pleopod 1. Pleopod peduncle lobes increasing in size from pleopod 2–5. Uropod peduncle as long as rami. Right uropod rami extending to pleotelson posterior margin, left uropod rami extending to half the length of the pleotelson (due to twisting). Uropod exopod extending to end of endopod, 3.3 times as long as greatest width.
3.1.4. Description paratype Ƌ (paratype)
Figs. 4–6 View Fig View Fig View Fig .
Body ovoid, 2.4 times as long as greatest width, dorsal surfaces smooth and polished in appearance, widest at pereonite 3, most narrow at pereonite 7, lateral margins mostly posteriorly ovate. Cephalon subtriangular, 0.3 times longer than wide; visible in dorsal view, with blunt point. Eyes oval with distinct margins, one eye 0.2 times width of cephalon, 0.3 times length of cephalon. Pereonite 1 smooth, anterior border medially straight, curved laterally, anteriorly expanded, anterolateral angle wide, with inwardly produced point, extending to
6
posterior margin of eyes. Posterior margins of pereonites smooth and slightly curved laterally, pereonite 7 medially recessed. Pereonites 1–3 increasing in length and width; 4–7 decreasing in length and width; 4–7 becoming progressively narrower, 2–3 subequal. Coxae 2–3 with posteroventral angles rounded; coxae 4–7 rounded; coxae 6–7 extending slightly past pereonite posterior margin. Pleon with pleonite 1 largely concealed by pereonite 7, slightly visible in dorsal view; pleonites posterior margin smooth, straight. Pleonite 2 partially overlapped by pereonite 7, posterior margin straight. Pleotelson 0.7 times as long as anterior width, dorsal surface smooth; lateral margins weakly convex; posterior margin converging to slight caudomedial point, evenly rounded.
Antennula consists of 8 articles; peduncle articles 1 and 2 distinct and articulated; article 2 1.6 times as long as article 1; article 3 1.6 times as long as wide, 0.6 times as long as combined lengths of articles 1 and 2; flagellum with 4 articles, without setae. Antenna consists of 8 articles; peduncle article 3 1.9 times as long as article 2; article 4 1.8 times as long as wide. 0.9 times as long as article 3; article 5 1.2 times as long as wide, 0.7 times as long as article 4; terminal article without setae. Mandible palp article 2 with 3 distolateral setae. Maxillula simple with 4 terminal robust setae; lateral lobe with 2 recurved robust setae; mesial lobe with 2 large recurved robust setae. Maxilliped consists of 3 articles,
7
article 3 with 4 recurved robust setae.
Pereopod 1 basis 2.1 times as long as greatest width; ischium 0.5 times as long as basis; propodus 1.9 times as long as wide; dactylus slender, 1.2 times as long as propodus, 3.8 times as long as basal width. Pereopod 7 basis without carina, 2.4 times as long as greatest width; ischium 0.6 times as long as basis; merus 0.9 times as long as wide, 0.6 times as long as ischium; carpus 0.9 times as long as wide, 0.6 times as long as ischium; dactylus slender, 1.3 times as long as propodus, 3.4 times as long as basal width.
Pleopods simple, with setae on peduncle of pleopod 3; exopod larger than endopod. Pleopod 1 exopod 1.4 times as long as wide, lateral margin weakly convex, distally broadly rounded, mesial margin weakly convex; endopod 1.6 times as long as wide, lateral margin weakly convex, distally broadly rounded, mesial margin straight, peduncle 2.8 times as wide as long. Pleopod 2 appendix masculina with parallel margins, 0.8 times as long as endopod, distally narrowly rounded. Pleopods 1–5 proximomedial lobes increasing in size, with proximomedial lobes. Pleopod peduncle lobes increasing in size from pleopod 2 to 5.
Uropod peduncle 0.6 times longer than rami, peduncle lateral margin without setae; rami extending beyond pleotelson posterior margin. Uropod endopod 3.3 times as long as greatest width, lateral margin straight, mesial margin weakly convex, terminating without setae. Uropod exopod extending beyond end of endopod, 5.4 times as long as greatest width, lateral margin straight, mesial margin straight, terminating without setae.
Penes distinct, distally rounded, 1.2 times as long as basal width.
Etymology. Named after the Andoni state and the Andoni Creek , from where the species was collected Noun in apposition.
Size. Ovigerous female 15.0 mm total length, 8.0 mm width. Non-ovigerous female 18.0 mm total length, 9.0 mm width. Males 7.0–12.0 mm total length, 4.0–5.0 mm width.
Remarks. Mothocya andoni n. sp. adult female specimens are characterised by the particularly large and wide coxa 7 extending posteriorly to pleonite 4; trapezoid shaped cephalon with subtruncate rostrum; pereonite 1 anterolateral angles only reaching to the posterior margin of eyes; pereopod 7 has a narrow basis; broadly rounded pleotelson; and uropods extending to the pleotelson posterior margin.
The only other known Mothocya from this region, Mothocya longicopa , has been recorded from western Africa, from Conakry, Liberia in the West to Fernando Po, Equatorial Guinea in the East, and is specific to Belonidae hosts: Ablennes hians , Belone belone and Tylosurus crocodilus crocodilus . Mothocya andoni n. sp. can be distinguished from Mothocya longicopa by: posterior coxae short and rounded ( Mothocya andoni n. sp.) vs elongate and posteriorly rounded ( M. longicopa ); uropodal rami both apically rounded, exopod 1.6 as long as endopod vs endopod apically acute, exopod 2.0 as long as endopod ( M. longicopa ); and the male is without the characteristically large proxomedial lobe on the pleopod 5 peduncle.
Mothocya andoni can also be compared to Mothocya omidaptria Bruce, 1986 ; Mothocya sajori Bruce, 1986 and Mothocya girellae Bruce, 1986 , all of which are somewhat similar in appearance. Mothocya omidaptria has been reported only from marine habitats in Rio de Janeiro, Brazil and Curaçao, West Indies ( Bruce, 1986) from the common halfbeak, Hyporhamphus unifasciatus ( Hemiramphidae ). This species can be distinguished from M. andoni by the following characters: a narrowly produced rostrum, compared to the blunt rostrum of M. andoni ; acute coxae of pereonite 7, versus the wider, broadly rounded coxae of M. andoni ; uropodal rami that extend well beyond the pleotelson posterior margin, compared to those of M. andoni that only reaching, or slightly exceed the pleotelson posterior margin; and the number of terminating robust setae on the maxillae and maxillipeds.
Mothocya sajori is only known from Japan, from the Japanese halfbeak Hyporhamphus sajori ( Hemiramphidae ). It can be distinguished from M. andori by the following characters: ovoid shape of the cephalon with weakly produced rostrum, versus the trapezoid shaped cephalon of M. andori , with subtruncate rostrum; narrower coxae with pointed posterior margins, compared to the wide, broadly rounded coxae of M. andoni .
Mothocya girellae has only been recorded from Lake Illawarra, southeastern Australia, from luderick, Girella tricuspidata ( Girellidae ). It can be distinguished from M. andoni by the following characters: coxae with narrowly rounded posterior margins, compared to the wide, broadly rounded coxae posterior margins of M. andoni (especially noticeable from male individuals); wider uropod exopod, with narrowly rounded apices, versus the narrower uropod exopod of M. andoni , with broadly rounded apices; maxilliped article 3 with four recurved setae ( M. andoni with five setae).
Mothocya andoni n. sp. was obtained from the branchial chambers of the pelagic–neritic African moony, Monodactylus sebae ( Monodactylidae ). This shoaling fish occurs in fresh, brackish and marine waters of the eastern Atlantic, from Cape Verde (West Africa) south to Angola, in shallow bays and lower courses of rivers, sometimes ascending over long distances upstream ( Vreven, 2008), and grows to a maximum standard length of 20 cm.
No substantial variation was noted between the examined ovigerous female holotype and non-ovigerous female paratype other than the development of a large brood pouch in the ovigerous specimen.
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.