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Zirfaea Pilsbryi Class: Bivalvia; Heterodonta Order: Myoida the Rough Piddock Family: Pholadidae

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Zirfaea Pilsbryi Class: Bivalvia; Heterodonta Order: Myoida the Rough Piddock Family: Pholadidae Phylum: Mollusca Zirfaea pilsbryi Class: Bivalvia; Heterodonta Order: Myoida The rough piddock Family: Pholadidae Taxonomy: The taxonomies of both pholad Teredinidae species, e.g., Bankia setacea, species in this guide (Z. pilsbryi and Penitella this guide) (see Plate 427F, 430D, Coan and penita) are extensive and complicated, Valentich-Scott 2007). While most pholad including many synonyms and overlapping species are intertidal or subtidal, some can be descriptions (for full list of synonymies see found boring into wood at great depths (e.g., Kennedy 1974). Zirfaea pilsbryi was originally 7,250 meters Xylophaga, Kennedy 1974; Reft described as Z. gabbii, a species eventually and Voight 2009; Voight 2009; Marshall and moved to the genus Penitella (see P. gabbii, Spencer 2013). Kennedy 1974). Lowe renamed and Body: (see Plate 297, Ricketts and Calvin described Z. pilbsryi in 1931. Thus, these 1952; Fig 361, Kozloff 1993). three species names (Z. pilsbryi, Z. gabbii, Color: and P. gabbii) and the subspecies Interior: designation, Z. gabbii femii (Adegoke 1967 in Exterior: Kennedy 1974), are common synonyms, with Byssus: descriptions that overlap and are specific to Gills: original author (see Kennedy 1974). Shell: Gapes widely at both ends and valves have ventral marginal groove (Fig. 2). Description Anterior end has rasping ridges, but posterior Size: Individuals up to 150 mm in length is with smooth, concentric lines (Haderlie and (Ricketts and Calvin 1971; Haderlie and Abbott 1980; Kozloff 1993). Anterior end of Abbott 1980; Kozloff 1993) and may be the shell is not as prominently demarcated from largest of the boring species (Ricketts and the posterior (compare to Penitella penita, this Calvin 1971). Coos Bay (Fossil Point) guide). Shell is relatively fragile as it gains specimens were approximately 75–125 mm ample protection from its surrounding burrow long. (Ricketts and Calvin 1952). Color: White exterior, interior also white or Interior: The groove separating light salmon (Turner 1954; Haderlie and anterior and posterior sections of valve (or Abbott 1980). Siphons gray-white to ivory, umbonal ventral sulcus) is conspicuous in speckled with very small (1.5–2 mm) orange juveniles, but almost disappears near ventral chitinous spots, dark red around siphonal margin in older specimens (Kennedy 1974) openings and incurrent cirri (Fig. 1). Foot and (Fig. 1). Strong muscle scars present, but no mantle are ivory in color, when preserved hinge or ligament (Pholadidae, Quayle 1970). (Turner 1954). Periostracum is dark brown Pallial sinus is broad and deep, extending (Haderlie and Abbott 1980). nearly to umbo (Fig. 3). The apophysis (or General Morphology: Bivalve mollusks are myophore) is broad, with rounded spoon- bilaterally symmetrical with two lateral valves shaped end (Fig. 3). or shells that are hinged dorsally and Exterior: Shape hard, solid, elongate, surround a mantle, head, foot and viscera oval, but not globose. Valves divided into two (see Plate 393B, Coan and Valentich-Scott regions: anterior triangular and posterior is 2007). Myoid bivalves are burrowers and rounded with concentric rings (Fig. 1). borers, with long siphons and hinges with few Anterior is triangular with rough file-like radial teeth (Coan and Valentich-Scott 2007). and concentric denticulations, which can Members of the Pholadidae bore into a project into spines on anterior margin (Fig. 1). variety of substrates, possess no pallets on Rasping portion covers half total valve area siphon tips and have an anterior end that is (Kozloff 1993). No callum is present pointed or curved with no notch (contrast to (calcareous anterior accessory plate, see Hiebert, T.C. 2015. Zirfaea pilsbryi. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. A publication of the University of Oregon Libraries and the Oregon Institute of Marine Biology Individual species: http://hdl.handle.net/1794/12922 and full 3rd edition: http://hdl.handle.net/1794/18839 Email corrections to: [email protected] Penitella penita, this guide), only a protective 4b). (Note: the mesoplax is often lost in membrane. Umbonal reflection is wide. The collecting.) anterior ventral edge of valve is strongly angled (Fig. 1). The posterior portion is with Possible Misidentifications concentric striations only and is rounded to There are several families of burrowing clams truncate (Fig. 1). Gapes extend to the middle and the Pholadidae can be distinguished by of the shell (Keen and Coan 1974). their distinctively marked body areas. Hinge: Members of the Teredinidae and Pholadidae Eyes: can be found locally. They can be Foot: Foot is round and truncate (Turner distinguished by the absence of pallets on 1954). siphon tips in the latter family as well as an Siphons: Fused and very long (6–8 times anterior end that is not notched, as in the the shell length) and can extend 15 cm above Teredinidae. The Pholadidae includes 10 the burrow surface (Haderlie and Abbott species locally, within the following genera: 1980). They are non-retractible and covered Barnea (B. subtruncata), Chaceia (C. with small chitinous discs, but without papillae ovoidea), Netastoma (N. rostratum), or pustules. No siphonoplax (flaps around Parapholas (P. californica), Penitella (five siphon, see Penitella penita, this guide). local species) and Zirfaea (Z. pilsbryi). The Periostracum extends from over 1/3 shell genus Zirfaea is characterized by adults that posterior to cover part of siphons (Quayle burrow into sand or mud, the absence of a 1970). callum in mature individuals, and a shell Burrow: Zirfaea pilsbryi burrows into heavy sculpture that is divided into two distinct mud, clay and shale to 50 cm depths. The zones (see Plates 427C, 429D, Coan and foot is sucker-like and attaches to the Valentich-Scott 2007). The genus Barnea, for substrate so that the shell can rotate slowly example, also lacks a callum, but does not and create a cylindrical burrow. Shell valves have these two distinct zones. All other local rock back and forth by contractions of anterior genera are characterized by the presence of and posterior adductor muscles. Individuals a callum and all except Netastoma have a rotate after each stroke, making a cylindrical myopore as well. Parapholas species have burrow. While burrowing, individuals exude shell sculpture with three distinct zones, particles out the inhalant siphon by where members of Chaceia and Pentilla have contracting their body quickly (Ricketts and two. Calvin 1952; Haderlie and Abbott 1980). The genus closest to Zirfaea, and Thirty-two movements make for one entire most likely to be confused with it, is Penitella. revolution, which takes a total of 70 minutes As mentioned above, Penitella’s valves are and after each revolution, the rotating also divided into two distinct sections, but it direction alternates (MacGinitie in Ricketts differs in having a calcareous anterior callum, and Calvin 1952). Burrows may be pear- or accessory plate (in the adult) as well as a shaped (producing Gastrochaenolites-type posterior which gapes only at the end, not to traces, Furlong et al. 2014) rather than cone- the middle of the shell (it has no anterior shaped, and individuals often do not fit as gape) and the apophysis is narrow, not broad. tightly within their burrows as other pholads No Penitella species has a siphon longer than (Evans and Fisher 1966). (see also Habitat its body (Evans and Fisher 1966) and all and Behavior.) Penitella species have retractable siphons. There are five species of Penitella in our area Pholadidae-specific character (see Coan and Valentich-Scott 2007). Mesoplax: There is only one mesoplax (or Penitella conradi is very small and is small accessory dorsal plate) present in this found in Mytilus or Haliotus (abalone) shells. species. It is weak and reduced (Evans and It has a siphonoplax lined with coarse Fisher 1966) and with a transverse basal granules (Zirfaea has no siphonoplax) (Evans flange that well-developed in juvenile (Fig. and Fisher 1966) and can bore into nephrite 4a), but becomes less obvious in adults (Fig. (Monterey, California, Wilson and Kennedy 1984). Penitella penita (see description in Hiebert, T.C. 2015. Zirfaea pilsbryi. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. this guide) has a heavy membraneous common fossil pholadid on the Pacific coast siphonoplax, a calcified callum and a and dates from the Pleistocene in California distinctive mesoplax. Its anterior rasping and northern Baja California (for pholad surface covers less than half the valve area palaeoecology see Kennedy 1974, 1993). (Kozloff 1974). It can be up to 70 mm in Local Distribution: Coos Bay distribution at length. Penitella fitchi also has a heavy South Slough, Fossil Point, Tillamook Bay, siphonoplax, but has a callum with a gap. Netarts Bay, Yaquina Bay (Turner 1954) and This is a rare species, found low in the Siuslaw River (Hancock et al. 1979). intertidal and up to 25 meters deep. Penitella Habitat: Zirfaea pilsbryi bores into shale, turnerae is larger than P. penita (to 125 mm), clay, sand or mud, as soft rock, to depth of and less common. It is stout, and like Zirfaea 25–35 cm (Turner 1954), where mud and clay lacks a siphonoplax. It has a distinctive, are preferred substrates (Coan and Valentich- rounded mesoplax, however, and its long, Scott 2007), but individuals are sometimes white, retractable siphons are tipped with seen in outside rocky reefs (Ricketts and solid red. Like Zirfaea, it has a strongly Calvin 1952). In one case, individuals were angled anterior ventral edge, but unlike seen burrowing into wood (Emerson 1951). Zirfaea, P. turnerae has a callum. Penitella Substrate type (e.g., hard versus soft) has richardsoni (=gabbi, Kennedy 1989) is also been shown to alter the piddock shell shape, small (up to 75 mm) with a warty, creamy- size and hardness (see Tajima and Kondo lemon colored siphon and it is not common.
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