Baeolidia scottjohnsoni, Carmona, Leila, Pola, Marta, Gosliner, Terrence M. & Cervera, Juan Lucas, 2014

Carmona, Leila, Pola, Marta, Gosliner, Terrence M. & Cervera, Juan Lucas, 2014, Review of Baeolidia, the largest genus of Aeolidiidae (Mollusca: Nudibranchia), with the description of five new species, Zootaxa 3802 (4), pp. 477-514 : 502-503

publication ID 10.11646/zootaxa.3802.4.5

publication LSID


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scientific name

Baeolidia scottjohnsoni

sp. nov.

Baeolidia scottjohnsoni View in CoL sp. nov.

LSID 1FEB 2E1A ( Figs. 3 View FIGURE 3 C, 12C, 13C–D, 14C)

Baeolidia sp. C: Carmona et al. 2013, 6.

Material examined. Holotype: CASIZ 184503, one specimen, dissected, 12 mm in length alive, Marshall Islands, Kwajalein Atoll, Enewetak Pinnacle, collected by Scott Joshnson, 11 October 2010. Paratype: CASIZ 180341, one specimen, dissected, 12 mm in length alive, Hawaii, Maui, Wahikuli, collected by Pauline Fiene, 30 November 2003.

Type locality and habitat. Enewetak Pinnacle, Kwajalein Atoll, Marshall Islands. Found in 10 m of water over Caulerpa .

Geographical distribution. So far, only known from the Marshall Islands and the Hawaiian Islands (present study).

Etymology. This species is dedicated to Scott Johnson who kindly provided us with abundant material from the Marshall Islands, including specimens of this new species.

External morphology ( Figs. 3 View FIGURE 3 C, 12C): Body short, broad, tapering close to posterior end of foot. Foot corners tentaculiform. Body brownish. Bright white spots over head, dorsum and foot. White spots over notum form almost a continuous patch from pericardial area to posterior end of foot, excluding ceratal insertions. Iridescent blue pigmentation over white spots, more evident on those parts of dorsum where groups of cerata from both sides are closer as well as close to ceratal insertion. Rhinophores, oral tentacles and foot corners brownish with bright white spots. Rhinophores approximately same length of oral tentacles. Rhinophores with elongated papillae ( Fig. 3 View FIGURE 3 C). Distal papillae whiter. Apex white. Oral tentacles with white spots. Cerata moderately short, flattened, leaf-like. Cerata slightly recurved inwards. Cerata brown with white spots on posterior side. Double subapical band on anterior side of cerata. Upper half of cerata white; second half iridescent blue that may reach their base. Orange or light ochre patch may be found on distal part of posterior side of cerata, being overlaid by bright ochre reticulate. Latter converges on apex. Apex with minute white ring. Cerata in two arches and two rows, leaving a distinct gap between pre and post-pericardial groups. Each group with 2–4 cerata, decreasing in size towards foot. Cleioproctic anus within second right arch. Genital aperture placed within anteriormost arch on right.

Anatomy. Masticatory process smooth ( Fig. 13 View FIGURE 13 C). Radular formula 14 x 0.1.0 (CASIZ 184503, 12 mm). Radular teeth slightly bilobed with 25 moderately broad and acutely pointed denticles on each side of the small and elongate central cusp ( Fig. 13 View FIGURE 13 D). Oral glands small, delicate (spongy), elongate. Salivary glands absent.

Reproductive system diaulic ( Fig. 14 View FIGURE 14 B). Preampullary duct widening into ampulla. Postampullary duct dividing into oviduct and vas deferens. Vas deferens moderately long vas deferens inserting into wider proximal portion of penial sac with unarmed penial papilla. Receptaculum seminis huge, folded, short stalk connecting to short oviduct, before latter forms female glands. Vagina ventral to penis.

Remarks. Excluding Baeolidia japonica , B. scottjohnsoni sp. nov. is easily distinguishable from other members of the genus due to its colouration and the shape and size of its receptaculum seminis. However, the brownish colour pattern of B. japonica has some resemblances with B. scottjohnsoni sp. nov.. Both species have brownish body colour, with white spots all over the notum and a blue band on the posterior side of the cerata. Furthermore, both species have a huge receptaculum seminis ( Figs. 6 View FIGURE 6 C and 14B). Nevertheless, the molecular phylogenetic analysis conducted by Carmona et al. (2013) (see Fig. 1 View FIGURE 1 ) clearly illuminated the presence of distinct cryptic species that are separated by some morphological differences. The blue pigment over the notum of B. scottjohnsoni sp. nov., differences in the radular morphology (denticles of B. scottjohnsoni sp. nov. are broader than those of B. japonica ), and the folded receptaculum seminis of B. scottjohnsoni sp. nov. distinguish these species.

Carmona et al. (2013) studied this species from a molecular approach ( Fig. 1 View FIGURE 1 ).













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