Henricia pumila Eernisse et al., 2010
Common name(s): Dwarf mottled henricia; mottled henricia
|Synonyms: Cribrella laeviuscula var. crassa?, Henricia leviuscula variety F|
|Henricia pumila from Sares Head, ray length 18 mm; diameter of central disk 5 mm.|
|(Photo by: Dave Cowles, August 2010 )|
The specific epithet pumila means dwarf. This species probably corresponds to at least some of the individuals described by Fisher (1911) as H. leviuscula variety F.
How to Distinguish from Similar Species: Most other Henricia do not have a mottled aboral side, broadcast spawn their eggs rather than brood them, have longer rays and a ratio between ray (R) length to inter-ray disk radius (r) of more than 5.
Geographical Range: The type specimen is from San Juan Island, WA. This is the only small, brooding Henricia in the Puget Sound area. Full range probably from Sitka, Alaska to upwelling areas in Baja California, but does not appear to inhabit southern California south of Point Conception.
Biology/Natural History: This species
broods its eggs and embryos under the central
disk until they crawl away as juveniles. Brooding seems to occur
January to April.
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Lamb and Hanby (2005) list it as Henricia sp. nov. on p. 330
Eernisse, Douglas J., Megumi F. Strathmann, and Richard R. Strathmann, 2010. Henricia pumila sp. nov.: A brooding seastar (Asteroidea) from the coastal northeastern Pacific. Zootaxa 2329: pp. 23-26
Fisher, W.K. (1911) Asteroidea of the North Pacific and adjacent waters. Part I. Phanerozonia and Spinulosa. Bulletin of the U. S. National Museum, 76(1), 1–406.
General Notes and Observations: Locations, abundances, unusual behaviors:
We freqnently encounter this species in the intertidal near Rosario.
This closeup of the aboral
surface of a ray shows the
pattern of pseudopaxillae.
is to the left.
Compare the pattern of these ossicles with that seen in Henricia leviuscula.
This oral view of the ray
shows the lighter color on the oral
side. Note that the marginal
plates are longer than other ossicles
but still not markedly enlarged.
is creamy colored as in the type specimen. Notice the papulae
extended among the pseudopaxillae.
This individual with a 5.5 cm total arm spread, was photographed in 2011. Found intertidally on Sares Head.
Rosario Invertebrates web site provided courtesy of Walla Walla University