Stenoninereis elisae, Conde-Vela, Victor Manuel, 2019
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publication ID |
https://dx.doi.org/10.3897/subtbiol.30.36273 |
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publication LSID |
lsid:zoobank.org:pub:13250A20-2FCC-48DE-828B-AE6CA926E94F |
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persistent identifier |
https://treatment.plazi.org/id/4F5D39E8-190E-288A-3EEB-538A6740B772 |
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treatment provided by |
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scientific name |
Stenoninereis elisae |
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sp. nov. |
Stenoninereis elisae sp. nov. Figures 1 B–F, I View Figure 1 ; 6 View Figure 6
Type material.
Syntypes. CARIBBEAN SEA, PUERTO RICO • 5; Rio Grande, Espiritu Santo River, 50 m below Castanon confluent; Apr. 1977; W.R. Bhajan leg.; USNM 55366.
Additional material.
CARIBBEAN SEA, PUERTO RICO • 3; Rio Grande, Espiritu Santo River, 50 m above Castanon confluent; W.R. Bhajan leg.; USNM 55360.
Type locality.
Espiritu Santo River, Rio Grande, Puerto Rico.
Description.
Five syntypes ( USNM 55366) complete, in good condition. Specimen dissected complete, 62 mm long, 0.4 m wide at chaetiger 10, 27 chaetigers. All specimens pale ( Figs 6 A–B View Figure 6 ).
Prostomium wider than long, anterior margin shallowly cleft ( Figs 1I View Figure 1 , 6C View Figure 6 ); antennae subulate, half as long as prostomium; eyes black, anterior and posterior eyes rounded, anterior eyes smaller than posterior ones, strongly overlapped, forming a pyriform spot ( Figs 1I View Figure 1 , 6 A–C View Figure 6 ). Achaetous ring as long as first chaetiger; four pairs of anterior cirri, longest one reaching chaetiger 6, anterodorsal pair lanceolate, remaining ones subulate ( Figs 1I View Figure 1 , 6 A–C View Figure 6 ).
Pharynx dissected; jaws brown, translucent, 8 teeth. Pharynx surface bare.
All chaetigers with noto- and neuroaciculae; dorsal cirri cirrophores and notopodial dorsal ligules of anterior chaetigers with ciliate surface. In first two chaetigers, notopodium with a small, rounded lobe bearing notoaciculum. Neuroacicular ligule subconical, twice longer than ventral cirrus. Ventral cirrus subulate, cirrophore and cirrostyle indistinct.
In anterior chaetigers ( Figs 6E View Figure 6 ), dorsal cirrus longer than chaetiger width, excluding parapodia; cirrophore 5.5-6.0 times longer than cirrostyle, 2.6 times longer than notopodial dorsal ligule, 3 times longer than notopodial ventral ligule. Notopodial dorsal ligule digitiform, basally attached to, and 1.2 times longer than, notopodial ventral ligule; notopodial ventral ligule subconical, 2.3 times longer than wide, 1.3 times longer than neuroacicular ligule. Neuroacicular ligule subconical, 1.5 times longer than wide, 2.2 times longer than ventral cirrus. Ventral cirrus subulate, cirrophore and cirrostyle indistinct.
In middle chaetigers ( Figs 6 F–G View Figure 6 ), dorsal cirrus longer than chaetiger width, excluding parapodia; cirrophore 2.5-3 times longer than cirrostyle, twice longer than notopodial dorsal ligule and becoming shorter toward posterior chaetigers, twice longer than notopodial ventral ligule. Notopodial dorsal ligule digitiform, as long as notopodial ventral ligule, rapidly decreasing in size toward posterior chaetigers and disappearing from chaetiger 23-25; notopodial ventral ligule subconical, twice longer than wide, 1.6 times longer than neuroacicular ligule. Neuroacicular ligule subconical, 1.2-1.4 times longer than wide, twice longer than ventral cirrus. Ventral cirrus subulate, cirrophore and cirrostyle indistinct.
In posterior chaetigers ( Fig. 6H View Figure 6 ), dorsal cirrus as long as chaetiger width, excluding parapodia; cirrophore 1.4 times longer than cirrostyle, 1.5 times longer than notopodial ventral ligule. Notopodial dorsal ligule absent; notopodial ventral ligule subconical, twice longer than wide, as long as neuroacicular ligule. Neuroacicular ligule subconical, 1.3 times longer than wide, 1.3 times longer than ventral cirrus. Ventral cirrus subulate, cirrophore and cirrostyle indistinct.
Notochaetae sesquigomph spinigers. Neurochaetae sesquigomph spinigers in supra-acicular fascicles, heterogomph spinigers and falcigers in sub-acicular fascicles.
Notopodial ( Figs 1C View Figure 1 , 6M View Figure 6 ) and neuropodial ( Fig. 1D View Figure 1 ) supra-acicular sesquigomph spinigers pectinate, very minute teeth, disappearing toward distal end. Neuropodial heterogomph spinigers ( Figs 1E View Figure 1 , 6I View Figure 6 ) serrate, coarse teeth, larger teeth longer than blade width, 1/3 of blade edentate, subulate. Neuropodial heterogomph falcigers ( Fig. 1F View Figure 1 ) with very long blades, blades increasing their length toward posterior chaetigers, blades with basal and medial teeth minute, often inconspicuous ( Figs 6 J–L View Figure 6 ), rarely some small teeth basally and distally ( Fig. 1E View Figure 1 ); supra-acicular blades shorter than sub-acicular ones, blades of sub-acicular falcigers increasing their length from upper to lower positions in the same fascicle ( Figs 6 J–L View Figure 6 ).
Pygidium with two anal plate-like lobes; anal cirri as long as last five chaetigers ( Fig. 6D View Figure 6 ).
Etymology.
The name is after the late Dr. Elise Wesenberg-Lund, in recognition of her many works in polychaete taxonomy, especially freshwater ones, and by proposing the genus Stenoninereis . The name is a noun in apposition and was formed by the elision of the last vowel for euphony.
Remarks.
Due to the morphological variability observed in specimens belonging to Stenoninereis , the designation of syntypes was preferred (ICZN 1999, Art. 72.3). Stenoninereis elisae sp. nov. is easily recognized by the enlarged dorsal cirri in anterior and middle chaetigers, being two or three times longer than the width of their respective segments, and by the size and proximity of the eyes resulting into a pyriform shape. The cirrophore/cirrostyle lengths ratio is also distinctive for this species because the cirrophore is longer than cirrostyle throughout the body, whereas in S. lackeyi comb. n., S. martini , and S. tecolutlensis , cirrostyles are longer than cirrophores in posterior chaetigers. Also, the cirrophore/cirrostyle lengths ratios in S. elisae sp. nov. are greater than in the other species, especially in anterior (5.5-6.0) and middle (2.5-3.0) chaetigers. Finally, the blades of the neuropodial heterogomph falcigers are denticulated, whereas in the remaining species they are smooth.
The notopodial dorsal ligules exhibit a high variation in their length as shown in the cirrophore/ notopodial dorsal and notopodial ventral ligules/notopodial dorsal ligules ratios in anterior (2.3-7.1 and 1.3-3.4, respectively) and middle (1.3-3.8 in both ratios) chaetigers. This variability in the size of the notopodial dorsal ligules was also observed in specimens of S. lackeyi comb. n., and S. martini , but the ratios are less variable.
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