Perinereis cariboea De León-González & Solís-Weiss, 1998

Conde-Vela, Víctor Manuel, 2022, Reinstatement of Perinereis bairdii (Webster, 1884) and description of P. websteri sp. nov. from Bermuda, including the reproductive morphology of two Atlantic Perinereis species (Annelida: Errantia: Phyllodocida), European Journal of Taxonomy 787 (1), pp. 104-145 : 132-135

Perinereis cariboea De León-González & Solís-Weiss, 1998

Figs 12–13

Perinereis cariboea de León-González & Solís-Weiss, 1998: 677–680 , figs 3a–e.

Type material examined

Holotype MEXICO • 1 spec.; Quintana Roo, Bahia Ascencion, Pajaros Point ; 6 Oct. 1983; V. Solís-Weiss leg.; USNM 180694 .

Additional material examined

MEXICO • 2 ♂♂; Quintana Roo, Isla Contoy ; 2 Mar. 2001; S.I. Salazar-Vallejo and L.F. Carrera-Parra leg.; ECOSUR P3209 .

Description of male

BODY AND MEASUREMENTS. Two specimens (ECOSUR P3209), one specimen complete, 20 mm long, 2.5 mm wide at chaetiger 10 excluding parapodia, 67 chaetigers ( Fig. 12A ), another one incomplete, 19 mm long, 2 mm wide at chaetiger 10 excluding parapodia, 62 chaetigers. Pigmentation present in anterior end, dark brown pigment in the anterior margin of prostomium and inner margins of palps, a continuous broad band with a row of white spots at the tentacular belt and dorsum of chaetigers 1–3, pigment fades at the center of the chaetigers 4–7, and become in two lateral rows until chaetiger 13 ( Fig. 12A–C ).

PROSTOMIUM. 1.6× as wide as than long, subpentagonal, anterior margin directed downward, dorsal groove present ( Fig. 12A–C ).

ANTENNAE. Subconical, oriented downward, half as long as prostomium, not extending beyond palps ( Fig. 12A–C ).

PALPS. Palpophores ovoid, swollen, as long as wide, shorter than prostomium, subdistal transverse groove present ( Fig. 12C ). Palpostyles globose.

EYES. Black, rounded, subequal, in rectangular arrangement, diameter 4–5 × longer than basal diameter of antennae, anterior and posterior pairs overlapped, lenses not visible, posterior pair slightly covered by tentacular belt ( Fig. 12A–C ).

TENTACULAR BELT. As long as chaetiger 1, with straight anterior margin ( Fig. 12A–C ).

TENTACULAR CIRRI. Smooth, cirrophores conspicuous, longest cirri extending backwards up to chaetiger 4 ( Fig. 12A–B ).

PHARYNX. Everted in one specimen ( Fig. 12C–D ); jaws brown, cutting edge with 6–7 rounded teeth. Maxillary ring: I = 9 cones in round; II = 13–14 cones in arc; III = 22 cones in ellipse; IV = 17–18 cones in round ( Fig. 12C–D ). Oral ring: V = none; VI = 2–2 smooth bar; VII–VIII = 19 cones in two bands: anterior band with 6 paragnaths in furrow row with 1 cone on the regions a–c, and 7 paragnaths in ridge row with 1 cone on the regions A–D; posterior band with 6 paragnaths in a single ridge row with 1 cone on the regions C–E ( Figs 12C–D , 13 ). Furrow pattern of areas VI–V–VI, λ-shaped ( Figs 12C , 13 ).

BODY REGIONS. Two regions: 1) pre-natatory region includes chaetigers 1–13, subdivided into two subregions: a) dorsal cirri in chaetigers 1–7 and ventral cirri in chaetigers 1–5 pyriform or cattail-like, and 2) chaetigers 8–13 with both dorsal and ventral cirri cirriform; 2) natatory region includes chaetigers 14 to end of body, chaetiger 14 with upper lamella in dorsal cirrus and both upper and lower lamellae in ventral cirrus, in chaetiger 15 and remaining ones also appear lower lamella in dorsal cirrus, a lamella below median ligule, ventral lamella and a basal, dorsal protrusion in neuropodial ventral ligules.

PRE- NATATORY REGION. Parapodia resembling atokous ones ( Fig. 12E–G ). Dorsal cirrus pyriform in chaetigers 1–7, and filiform in remaining chaetigers ( Fig. 12E–G ); 1.8 × as long as distal lobe of dorsal ligule in chaetigers 2–6, 1.6× in chaetiger 12 ( Fig. 12E–G ); 7.5× as long as proximal lobe of dorsal ligule in chaetiger 2, 2× in chaetiger 6, 1.7× in chaetiger 12. Dorsal ligule rounded in first chaetigers, becoming subconical with blunt tip toward posterior ones; distal lobe of dorsal ligule 1.2× as long as median ligules in chaetigers 6–12 ( Fig. 12E–G ). Median ligule digitiform throughout, 2× as long as neuroacicular ligule in chaetigers 6–12 ( Fig. 12E–G ). Neuroacicular ligule subconical throughout; 1.7× as long as ventral ligule in chaetiger 2, 1 × in chaetigers 6–12 ( Fig. 12E–G ). Neuropodial superior and inferior lobes very small, almost inconspicuous; neuropodial postchaetal lobe rounded, half as long as neuroacicular ligule. Ventral ligule digitiform throughout; 1.2× as long as ventral cirrus in chaetiger 2,

1× in chaetiger 6, 0.7× length in chaetiger 12 ( Fig. 12E–G ). Ventral cirrus pyriform in chaetigers 1–5, filiform thereafter ( Fig. 12E–G ).

NATATORY REGION. Parapodia distinct from atokous ones ( Fig. 12H–J ). Dorsal cirrus filiform, crenulations present from chaetiger 15, decreasing in size and number toward posterior chaetigers until disappear ( Fig. 12H–J ); 1.8× as long as distal lobe of dorsal ligule in chaetiger 14, 1.4× in chaetiger 18, 1.7× in chaetiger 35 ( Fig. 12H–J ). Upper lamella of dorsal cirrus present since chaetiger 14, digitiform in chaetiger 14, flabellate thereafter, larger in middle chaetigers, as long as dorsal cirrus in chaetiger 35 ( Fig. 12H–J ); ventral lamella since chaetiger 14, flabellate and smaller than upper lamella of dorsal cirrus throughout ( Fig. 12H–J ). Dorsal ligule subconical in chaetiger 14, digitiform thereafter, becoming narrower toward posterior chaetigers ( Fig. 12H–J ); distal lobe of dorsal ligule 1 × length of median ligule in chaetiger 14, 1.5 × longer in chaetigers 18–35 ( Fig. 12H–J ). Notopodial prechaetal lobe rounded, lamelliform, present since chaetiger 15; 0.3× as long as dorsal ligule in chaetigers 18–35 ( Fig. 12H–J ); small basal lamella of median ligule present since chaetiger 15, flabellate throughout ( Fig. 12H–J ). Neuroacicular ligule subconical in chaetiger 14, digitiform thereafter ( Fig. 12H–J ), superior and inferior lobes absent; 1 × as long as ventral ligule in chaetiger 14, 1.2× longer in chaetiger 18–35 ( Fig. 12H–J ). Neuropodial postchaetal lobe rounded in chaetiger 14, transformed into broad flabellate ventral lamella with a basal, dorsal protrusion thereafter ( Fig. 12H–J ); 1.5× as long as neuroacicular ligule in chaetigers 18–35 ( Fig. 12H–J ). Ventral ligule digitiform and with small basal, dorsal lobe starting in chaetiger 15 ( Fig. 12H–J ); 0.7× as long as ventral cirrus in chaetiger 14, 0.8 × in chaetigers 18–35 ( Fig. 12H–J ). Ventral cirrus filiform throughout ( Fig. 12H–J ); upper lamella divided in two subequal, digitiform lobes ( Fig. 12H–J ); lower lamella flabellate, 4–5 × as wide as upper ones throughout ( Fig. 12H–J ).

ACICULAE. Basally amber and distally dark brown, amber region enlarges toward posterior chaetigers. Notoaciculae absent in first two chaetigers, proximal end rectangular in non-natatory region and becoming flabellate in natatory one.

NOTO- AND NEUROCHAETAE. Resembling atokous ones in non-natatory region, replaced with paddle-like, heterogomph chaetae with short bosses in natatory region.

PYGIDIUM. Crenulated, with a rosette of papillae formed by two or three rows of papillae; anal cirri missing ( Fig. 12A ).

Remarks

Perinereis cariboea has been scarcely recorded since its description; here is described its epitokal morphology, unknown until now. This species is easily identified among the species herein studied by its pharyngeal arrangement: no paragnaths in area V, two smooth bars on each area VI, and a discontinuous posterior band of paragnaths in areas VII–VIII. Atokes of P. cariboea are similar to P. bairdii because of the short tentacular cirri and the similar development of parapodia along the body. Regardless of the pharyngeal arrangement, the males of this species can be differentiated from males of P. bairdii as follows: 1) in P. cariboea , dorsal cirri are pyriform in chaetigers 6–7, whereas in P. bairdii they are cattail-like; 2) in P. cariboea , ventral cirri are longer than ventral ligules in chaetigers 12–13, whereas in P. bairdii they are shorter; 3) in P. cariboea , dorsal and ventral ligules are subequal in chaetiger 14, whereas in P. bairdii dorsal ligule is 2.7 × as long as ventral one; 4) in P. cariboea , upper lamellae of dorsal cirri in natatory chaetigers are as long as dorsal cirri in chaetigers 30–35, whereas in P. bairdii they are 0.7 × the length; 5) in P. cariboea , ventral lamella is 1.5× as long as neuroacicular ligules in chaetiger 30, whereas in P. bairdii they are 2.5 × longer.

Distribution

Caribbean Sea.

Figures

Fig. 12. Perinereis cariboea De León-González & Solís-Weiss, 1998. Non-types (ECOSUR P3209). A. Whole specimen, dorsal view. B. Anterior end, dorsal view. C. Anterior end, dorsal view. D. Same, ventral view. E. Chaetiger 2, right parapodium. F. Chaetiger 6, right parapodium. G. Chaetiger 12, right parapodium. H. Chaetiger 14, right parapodium. I. Chaetiger 18, right parapodium. J. Chaetiger 35, right parapodium in anterior (left) and posterior (right) views. Scale bars: A = 5 mm; B–D = 1 mm; E = 0.25 mm; F–J = 0.5 mm.

Fig. 13. Arrangement of paragnaths in the ridge and furrow regions of areas VII–VIII in species of Perinereis Kinberg, 1865. Filled figures with solid edges represent paragnaths observed in all specimens examined, no-filled figures with dashed edges represent paragnaths observed in some specimens only.